33 lines
469 B
ArmAsm
33 lines
469 B
ArmAsm
.sect .text; .sect .rom; .sect .data; .sect .bss
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.sect .text
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.define .sar2
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.sar2:
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! bx, descriptor address
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! ax, index
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pop cx
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pop dx ! base address
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push cx
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xchg di,dx ! di = base address, dx is saved di
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sub ax,(bx)
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mov cx,4(bx)
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push dx
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imul cx
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pop dx
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add di,ax
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sar cx,1
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jnb 1f
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pop bx
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pop ax
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stosb
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mov di,dx
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jmp bx
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1:
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pop bx
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mov ax,si
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mov si,sp
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rep movs
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mov sp,si
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mov si,ax
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mov di,dx
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jmp bx
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